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Restructuring Charges, Net - Changes In Restructuring Liability (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period $ 6,257   $ 13,695  
Restructuring charges, net   $ 3,801 78 $ 28,321
Reductions for cash payments (1,294)   (9,506)  
Exchange rate fluctuations 178   874  
Liability, Ending period 5,141   5,141  
Severance        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 1,541   5,341  
Reductions for cash payments (231)   (4,178)  
Exchange rate fluctuations 123   270  
Liability, Ending period 1,433   1,433  
Facilities        
Restructuring Cost and Reserve [Line Items]        
Liability, Beginning period 4,716   8,354  
Restructuring charges, net     78  
Reductions for cash payments (1,063)   (5,328)  
Exchange rate fluctuations 55   604  
Liability, Ending period $ 3,708   $ 3,708